LTC1391 8-Channel Analog Multiplexer with Cascadable Serial Interface FEATURES DESCRIPTIO n Low R : 45W The LTC 1391 is a high performance CMOS 8-to-1 analog ON n Single 2.7V to 5V Supply Operation multiplexer. It features a serial digital interface that allows n Low Charge Injection several LTC1391s to be daisy-chained together, increas- n Serial Digital Interface ing the number of MUX channels available using a single n Analog Inputs May Extend to Supply Rails digital port. n Low Leakage: 5nA Max The LTC1391 features a typical R of 45W , a typical ON n Guaranteed Break-Before-Make switch leakage of 50pA and guaranteed break-before- n TTL/CMOS Compatible for All Digital Inputs make operation. Charge injection is 10pC maximum. All n Cascadable to Allow Additional Channels digital inputs are TTL and CMOS compatible when oper- n Can Be Used as a Demultiplexer ated from single or dual supplies. The inputs can with- U stand 100mA fault current. APPLICATIO S The LTC1391 is available in 16-pin PDIP, SSOP and n Data Acquisition Systems narrow SO packages. For applications requiring 2-way n Communication Systems serial data transmission, see the LTC1390 data sheet. n Signal Multiplexing/Demultiplexing , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO On-Resistance vs 3V, 8-Channel 12-Bit ADC Analog Input Voltage 3V 300 OPTIONAL A/D 0.1F 1F T = 25C 1 8 A 1 16 + INPUT FILTER V V S0 V REF CC 250 2 7 + 2 15 V = 2.7V +IN CLK S1 D V = 0V LTC1285 3 14 3 6 W 200 S2 V IN D OUT 4 13 4 5 S3 D ANALOG OUT GND CS/SHDN 150 5 LTC1391 12 INPUTS S4 D IN 6 11 S5 CS 100 7 10 + S6 CLK V = 5V 8 9 V = 5V 50 S7 GND 0 DATA IN 5 4 3 2 1 0 1 2 3 4 5 CLK SERIAL INTERFACE ANALOG INPUT VOLTAGE (V) TO MUX AND ADC CS 1391 TA02 DATA OUT 1391 TA01 sn1391 1391fas 1 ON-RESISTANCE ( ) U ULTC1391 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) + TOP VIEW Total Supply Voltage (V to V ) .............................. 15V ORDER PART + Input Voltage S0 1 16 V NUMBER + 2 S1 15 D Analog Inputs/Outputs ..... (V 0.3V) to (V + 0.3V) LTC1391CGN 3 S2 14 V Digital Inputs .........................................0.3V to 15V LTC1391CN + 4 S3 13 D OUT Digital Outputs ..........................0.3V to (V + 0.3V) LTC1391CS 5 12 S4 D IN Power Dissipation.............................................. 500mW LTC1391IGN 6 11 S5 CS Operating Temperature Range LTC1391IN 7 10 S6 CLK LTC1391C ............................................... 0 C to 70 C LTC1391IS 8 9 S7 GND LTC1391I........................................... 40 C to 85 C GN PACKAGE N PACKAGE Storage Temperature Range ................. 65 C to 150 C GN PART MARKING 16-LEAD PLASTIC SSOP 16-LEAD PDIP Lead Temperature (Soldering, 10 sec).................. 300 C S PACKAGE 16-LEAD PLASTIC SO 1391 T = 125 C, q = 110 C/ W (GN) JMAX JA 1391I T = 125 C, q = 70 C/ W (N) JMAX JA T = 125 C, q = 100 C/ W (S) JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating + temperature range, otherwise specifications are at T = 25 C. V = 5V, V = 5V, GND = 0V, unless otherwise specified. A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switch V Analog Signal Range (Note 2) l 5 5 V ANALOG R On-Resistance V = 3.5V, I = 1mA T = 0 C (LTC1391C) 75 W ON S D MIN T = 40 C (LTC1391I) MIN 25 C4575 W T = 70 C (LTC1391C) 120 W MAX T = 85 C (LTC1391I) MAX D R vs V 20 % ON S D R vs Temperature 0.5 %/ C ON I Off Input Leakage V = 4V, V = 4V, V = 4V, V = 4V 0.05 5nA S(OFF) S D S D Channel Off l 20 nA I Off Output Leakage V = 4V, V = 4V, V = 4V, V = 4V 0.05 5nA D(OFF) S D S D Channel Off l 20 nA I On Channel Leakage V = V = 4V 0.05 5nA D(ON) S D Channel On l 20 nA Digital + V High Level Input Voltage V = 5.25V l 2.4 V INH + V Low Level Input Voltage V = 4.75V l 0.8 V INL I , I Input Current V = 5V, 0V l 5 m A INL INH IN + V High Level Output Voltage V = 4.75V, I = 10m A 4.74 V OH O + V = 4.75V, I = 360m A l 2.4 4.50 V O + V Low Level Output Voltage V = 4.75V, I = 1.6mA l 0.5 0.8 V OL O sn1391 1391fas 2 U WWW